Added aggregations and GROUP BY (#17)

tests/sqlite/test_range_select_from_with_to.cpp

@@ -0,0 +1,50 @@
+
+#include <gtest/gtest.h>
+
+#include <ranges>
+#include <rfl.hpp>
+#include <rfl/json.hpp>
+#include <sqlgen.hpp>
+#include <sqlgen/sqlite.hpp>
+#include <vector>
+
+namespace test_range_select_from_with_to {
+
+struct Person {
+  sqlgen::PrimaryKey<uint32_t> id;
+  std::string first_name;
+  std::string last_name;
+  int age;
+};
+
+TEST(sqlite, test_range_select_from_with_to) {
+  const auto people1 = std::vector<Person>(
+      {Person{
+           .id = 0, .first_name = "Homer", .last_name = "Simpson", .age = 45},
+       Person{.id = 1, .first_name = "Bart", .last_name = "Simpson", .age = 10},
+       Person{.id = 2, .first_name = "Lisa", .last_name = "Simpson", .age = 8},
+       Person{
+           .id = 3, .first_name = "Maggie", .last_name = "Simpson", .age = 0}});
+
+  using namespace sqlgen;
+
+  struct FirstName {
+    std::string first_name;
+  };
+
+  const auto people2 =
+      sqlite::connect()
+          .and_then(drop<Person> | if_exists)
+          .and_then(write(std::ref(people1)))
+          .and_then(select_from<Person>("first_name"_c) | order_by("id"_c) |
+                    to<std::vector<FirstName>>)
+          .value();
+
+  EXPECT_EQ(people2.at(0).first_name, "Homer");
+  EXPECT_EQ(people2.at(1).first_name, "Bart");
+  EXPECT_EQ(people2.at(2).first_name, "Lisa");
+  EXPECT_EQ(people2.at(3).first_name, "Maggie");
+}
+
+}  // namespace test_range_select_from_with_to
+